Salt preparation

Question 1

What is a salt

Answer 1

Compound formed that replaces hydrogen in a acid w a metal OR a radical acting like a metal.

IONIC

Question 2

What are methods for soluble in water salts

Answer 2

• Titration (both soluble)
• Excess reactant (one insoluble one nkt)

ACIDS USED

Question 3

what if salt insoluble in water

Answer 3

precipitation

Question 4

Precipitation elab

Answer 4

2 soluble reactant= 1 insoluble reactanr

Question 5

Procedure for precipitation

Answer 5

1. Add both soluble reactants in a beaker
   filter the solution and keep the residue
   wash fhe precipitate w deionised paper and pat dry w filter paper

Question 6

how to prepare barium sulfate

Answer 6

barium nitrate and sodium sulfate

Question 7

excess insoluble reactant method

Answer 7

prepare soluble salts from an acid using excess insoluble reactant

metal insoluble metal carbonate and metal oxide

Question 8

Steps for salt prep w insoluble reactant

Answer 8

1. Prepare a beaker of known conc and volume

2 using a spatula, add solig ___ in excess, stirring thoroughly btw addition btw addition. stop adding when solid no longer dissolves when stirring

3. Filter to remove excess insoluble reactant as residue. filtrate is the salt solution
4. heat the salt solution to obtain a saturated solution
5. Leave the solution to cool. Crustals will form
6. filter to obtain crystals
7. wash crystals w cold distilled water
8. pat dry crystals in btw 2 pieces of filter paper.

Question 9

Why use excess insoluble reactant

Answer 9

to ensure that the reactant in the acid becomes limiting reactant and completely used up at the end, so only salt solution left (pure)

allow acid to fully react w insoluble salt to produce pure salt solution

Question 10

TITRATION for?

Answer 10

prepare soluble salt from 2 soluble recatants

Question 11

Why titration for grp 1 and ammonium salts?

Answer 11

salts and soluble reactant ALL SOLUBLE

Question 12

Why exact amount of reactant

Answer 12

ensure both reactant fully react w another, thus no contaminants and salt is easily purified.

wash stuff throughly

Question 13

Procedure for salt prep

Answer 13

1. Titrate reacts w a known and fixed amt of reactant using a methyl orange indicator
2. Note the vol. taken for reactant 1 (acid / any) to fully react w reactant 2 ( other reactant / alkali) .
3. repeat experiment using titration volumes obtained, but w/o the indicator solution
4. heat solution to saturation point
5. leave solution to cool and crystallize
6. filter the solution to obtain residue of salt crystals
7. wash crystals in deionized water
8. pat crystals dry w filter paper

Question 14

Why do we do w/o the indicator

Answer 14

Acts as a contaminant which decreases purity of salt

Question 15

crystallization

Answer 15

ideal for purifying salts of crystallization

Question 16

hydrated salts

Answer 16

salts that contain water of crystallization

Question 17

Why heat up acid

Answer 17

Increase rate of reaction of acid and reactant

Question 18

How to see if reaction complete

Answer 18

When residue does not dissolve despite stirring for excess soluble reacting

Solid at the bottom present

Question 19

Wash crystals w small amt of cold distilled water

Answer 19

Remove impurities without dissolving the salt crystals in water